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i had converted image into blocks. I converted blocks to linear array. Next i calculated mean values for first 8 arrays as given below. now i want to convert mean values to linear array again. please send suitable code. please don't ignore it. help .

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sri raj
sri raj 2016-3-27
评论： sri raj 2016-4-4
for i=1:4:16
for j=1:4:16
block=I(i:i+3,j:j+3);
%convert 4X4 into 16X1 column vector
tv(:,col)=reshape(block,16,1);
col=col+1;
count=count+1;
column=column+4;
end
row=row+4;
end
%find mean of 8 arrays
nn=8;
for count=1:16
sum1=sum1+tv(:,count);
if count==nn*nnn
cv(:,r)=sum1/8;
sum1=0;
nnn=nnn+1;
r=r+1;
end
end
  2 个评论
Star Strider
Star Strider 2016-3-27
You cannot un-fry that egg.
Calculating a mean — even with the standard deviation — requires that you throw away information that you can never again retrieve. The best you can hope for is a vector the same size as the original, every element being the mean.

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采纳的回答

Walter Roberson
Walter Roberson 2016-3-27
Your code does not calculate mean values -- not unless nnn happens to equal 1, and for some odd reason you only want the first 8 values to be included even though your loop goes to 16.
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Image Analyst
Image Analyst 2016-4-3
If you're in a loop, just have the upper limit be 8 and it will only do 8
for blockNumber = 1 : 8
% code
stdDev(blockNumber) = std(............
end

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更多回答（1 个）

Image Analyst
Image Analyst 2016-3-27
Exactly what values are you hoping to have in this second linear array? If you want the first ones, simply use the original values
secondLinearArray = firstLinearArray;
If you want the means, then use repmat, imresize, or other approaches to create it from your means, for example
secondLinearArray = theMean * ones(size(firstLinearArray));

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